Award Date

1-1-1990

Degree Type

Thesis

Degree Name

Master of Science (MS)

Department

Biological Science

Number of Pages

48

Abstract

Temporal and spatial patterns of age 0 threadfin shad (Dorosoma petenense) abundance and growth, in the Overton Arm of Lake Mead, were examined to evaluate the effects of resource availability on the young fish. This was part of the Lake Mead Fertilization Project, designed to assess feasability of increasing survivorship of juvenile shad by boosting phosphate, thereby increasing algal and zooplankton biomass, during the shad spawning period. Shad are the primary forage base for the striped bass (Morone saxatilis) and black bass (Macropterus salmoides); Weekly samples were taken from June to mid-August, in 1988 and 1989. Depth series samples were taken with a Tucker Trawl at some stations and dates. Chlorophyll {dollar}\alpha{dollar} concentrations and Daphnia pulex egg/adult female ratios, were also determined for some stations and dates; There was an apparent link between resource availability and young shad abundance. There was little temporal or spatial variation in mean length. (Abstract shortened with permission of author.).

Keywords

Abundance; Age; Arm; Dorosoma; Lake Mead; Overton; Patterns; Petenense; Shad; Spatial; Temporal; Threadfin; Utah

Controlled Subject

Ecology; Limnology; Forests and forestry

File Format

pdf

File Size

1013.76 KB

Degree Grantor

University of Nevada, Las Vegas

Language

English

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